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Re: st: Questions about selmlog and svyselmlog


From   "Yu(Sophia) Zhang" <sophia.zhangyu@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Questions about selmlog and svyselmlog
Date   Tue, 19 Oct 2010 23:51:46 -0400

Dear Joao,

  Thanks so much for your reply. The second question has been solved
following your suggestion.

   For the first one, do you mean that across all categories ( which
are schools in my selection equation), only one category can have
non-missing values of dep var, and the other categories must have some
missing values of depvar? I deleted some values of depvar to meet this
requirement, but I still got the same error. Would you mind explaining
it in more detail?

  Thank you so much!

  Yu

On Tue, Oct 19, 2010 at 7:03 PM, Joao Ricardo F. Lima
<jricardofl@gmail.com> wrote:
> Yu,
>
> About the first question:
>
> The vardep  of the income equation must have non missing values ONLY
> for one category.
>
> About the second:
>
> the svyselmlog was written to Stata 8. Then, try this:
>
> version 8: svyset [pweight = varw], psu(varpsu) strata(varstrat)
> svyselmlog vardep varindep , sel() meth() boot()....
>
> Hope this Helps,
>
> Joao Lima
>
>
> 2010/10/19 Yu(Sophia) Zhang <sophia.zhangyu@gmail.com>:
>> Dear statisticians,
>>
>>     I am now working on my dissertation and am stuck by a STATA command.
>> Basically, I want to run Heckman correction based on the multinomial logit
>> model. I am going to use the command selmlog. However, a strange error shows
>> up like this:
>>
>> Non-missing values of dependent variable for more than one outcome
>> variable _m* not found
>>
>>    I guess it might be associated with this statement in the help file:
>>
>> 1) In the output, selmlog adds to varlist a series of variables labelled
>> _m[depvar_m value], except for the dhl option
>>
>> 2) The outcome variable depvar is observed for only one value of depvar_m.
>> It is important that depvar should have missing values for any other value
>> of depvar_m.
>>
>>    But still cannot figure out what's wrong.
>>
>>    In addition, when I want to control for sampling weights by running the
>> command svyselmlog, I get another error:
>>
>> data not set up for the old survey estimation commands; use svyset under
>> version control or use the new svy prefix.
>>
>>   But there is no "svy: selmlog" command in STATA 11.....
>>
>>     I wonder if someone could kindly give me some hint for these two
>> problems. I have asked several people but no one were familiar with this
>> problem.
>>
>>     I appreciate your help very much.
>>
>>     Sincerely,
>>
>>     Yu
>>
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>>
>
>
>
> --
> ---------------------------------------------------------
> João Ricardo F. de Lima
> Pesquisador A - Economia Aplicada
> Embrapa Semiárido
> e-mail: joao.ricardo@cpatsa.embrapa.br
> fone: +55 (87) 3862-1711 Ramal: 167
> home-page: www.cpatsa.embrapa.br
> ----------------------------------------------------------
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>



-- 
Yu Zhang
PhD Candidate
Economics and Education
Teachers College, Columbia University

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


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